Miltschinoff studied singing in Vienna (hence the German transliteration; alternatively, you'll also find him as Aleksander Milchinov).
His career developed as follows:
1947–1948 Theater am Gärtnerplatz München
1950–1956 Dresden, and appearances at the Staatsoper Berlin and the Metropol-Theater Berlin
Guest appearances in France, Italy, Belgium, Switzerland, Yugoslavia and Austria.
Miltschinoff sang in concerts, on radio and made TV appearances.
His repertory included: Duca, Otello, Tannhäuser, Florestan, ...
He moved in 1956 to Vienna and made guest appearances in operettas (e.g. as Graf Erminio Saluzzo in Gasparone).
Since 1958, he taught singing at the Wiener Musikhochschule.
Reference: Kutsch & Riemens